Our site is dedicated to helping people develop better stoves for cooking with biomass fuels in developing regions.

For additional detail and information, join the Cooking Stoves Mailing List, browse the archives, read about current projects and ask other cooking stove builders, designers, and organizations disseminating improved stoves around the world.

In their presentation at the GACC forum, Paul Means and Chris Lanning take a look at the supply chain problem with using woody biomass as a replacement for charcoal in urban areas, and they propose some ideas for equipment that may overcome those problems, as well as identifying some of the challenges to that approach.

See the full presentation here:
http://www.stoves.bioenergylists.org/files/woody_biomass_supply_chains_-_gacc_forum_2013_r.pdf

baking orange cake in oranges
open day baking class demonstration
tree seeds and charcoal farming demo
one of the posters

A wonderful afternoon with Susan Kamau's Kenya Kitchens Cooking Club. Susan is a Global Alliance for Clean Cookstoves Ambassasdor Chef and we very pleased to partner with her to have a open afternoon at UCHUMI SUPERMARKETS LTD to hold a baking demonstration and discussion about energy conservation, clean cooking, nutritional baking as a business and of course healthy delicious eating!

Removing Handles
Cutting the Throat Hole
Cutting a Top Hole
Internal Elbow
Sheet Metal Held in place with Vermiculite

Nothing fancy but more on the same theme

M Trevor.

The Tin Shed Rotary program in Labardore, Goldcoast, Queensland Australia has been making Wood gas stoves out of old gas bottles and shipping them to Vanuatu. The last picture is the people of Vanuatu with their stoves.

More detail is in the captions or contact
David Bramham
dgbramham@optusnet.com.au

On February 22, 2012 I did three boiling tests.

The first test was carried out on a normal propane gas burner that I have in my kitchen.

http://youtu.be/w8OdW_GEhWo
Here it took 6 minutes and 6 seconds to bring one liter of water to a boil.
The burner shown in this video is a very efficient premix gas burner.
But since it operates solely by means of convection, its performance is not optimal.

The second test was carried out using the 150 gasifier:

http://youtu.be/jK3UTe1Lxqk
Here it took 3 minutes and 42 seconds to bring one liter of water to a boil.
Note that the same pan without a lid was used in these two boiling tests.
Here heat is transferred by both convection and thermal radiation.

The third test was carried out using an insulated electric water kettle, as shown here:
http://dl.dropbox.com/u/22013094/150%20Gasifier/Boiling/IMG_1042.JPG
Here it took 3 minutes and 25 seconds to bring one liter of water to a boil.
In this way I was able to compare the two previous results
with what could be considered to be the fastest way to boil water in a kitchen setting.

I wonder if you have found any technical design literature for this added radiative mesh? (Materials, wire diameters and spacing, etc?)

I have no theoretical understanding with regard to what is happening with the wire mesh dome.
I tried flat wire mesh, and this did not work at all.
The wire mesh has to be in the form of a dome to accommodate the small diffusion tail that you see here:
http://youtu.be/WXZvvoxCm1g

I tried wire meshes of various apertures.
If the aperture of the wire mesh is too big, the flames are not contained properly under the dome.
If the burning of gases takes place above the dome, the dome does not turn red hot.
This week I will experiment with much finer wires and apertures.

Also, if I turn down the primary air to a point where much less gas is produced,
combustion no longer takes place at the burner holes but within the apex of the dome.
Here a most unusual but stable cloud of burning gases is formed.

Flip Anderson, Haiti Rocket Stove
Aprovecho StoveTec
Mayon Turbo Rice Husk Stove
BioLite Camp Stove
BioLite Camp Stove in Christa Roth's Demonstration House

(Thanks to Ben Sloan!) the presentations are posted on the ETHOS website: http://www.vrac.iastate.edu/ethos/proceedings2013.html

Save the Date!: ETHOS 2014, it will be at Northwest University in Kirkland, Washington on January 24 - 26, 2014.

Dear Friends

This is very useful.

Save it!

y = 4-08x2 - 0.0036x + 99.996

X = your altitude in meters.
Y = the local boiling point (at standard air pressure)

If you know your altitude, it will give you the ‘standard’ boiling temperature.
If you know the local boiling point, you can work backwards to get the altitude where you are standing.

Excel cell contents:

=99.996-0.0036*Altitude+4*10^-8*Altitude

where ‘Altitude’ is the cell in which the altitude is located.

Regards
Crispin

Jiko Bomba, load the lower half with pellets
Jiko Bomba Gasifying the Pellets and making char
Jiko Bomba, blue flame showing gasification
Jiko Bomba, lower chamber, where charred pellets can be used for low temperature Cooking

Here is some pictures of the Jiko Bomba casification cookstove.
The first shows the two part of the stove with pellet as fuel in the firebox before fire is lit.
Second show the stove burning.
The third the same, in the end of the gasification.
The forth shows the charcoal stage where the pellets remains as glowing carbon. A pot can be put on top of the bottom part of the stove, there are three supports for that.

Yours
Bjarne Laustsen

Here is an example (hard to see of course because it is a still taken from a video) of the spinning of the flame caused by the shaped grate at the bottom.
The fire is circular because it is spinning rapidly, though pushed to the side by the way the fuel happened to be sitting. The spin adds turbulence without a fan and assists in keeping the flame away from the combustion chamber wall.
Here is a really cool picture of a Vesto burning walnut shells in TLUD mode.
Finally, here is a photo of a Vesto cutaway showing the inside parts in their correct positons.

Dear Marc and Ron and All interested in air flows

This is a response to questions about air and Marc’s tube.

Here is an old photo of secondary air entering the combustion chamber of a Vesto pushing the flame to the centre. This accomplishes the following:

Keeps the fire away from the wall, reducing the temperature it has to survive (a lot)
Keeps the flame going
Not allowing it to spread to one side away from the smoke on the other side that might otherwise ‘get away’.
Provides turbulent mixing of flame, hot secondary air and smoke
Allows for preheating to a significant degree (250-500 C)

The fire is circular because it is spinning rapidly, though pushed to the side by the way the fuel happened to be sitting. The spin adds turbulence without a fan and assists in keeping the flame away from the combustion chamber wall.

Here is a Vesto burning switchgrass pellets operating as TLUD, showing that there is nothing special about a TLUD in the sense of it having to operate in a particular fashion. The air flow through the fuel is reduced by the fuel and it operates as a TLUD. The secondary air is send across the surface to keep a deck of flame going at the height of the holes. This obviates the need for adding a circular disk at the top to ’keep the flame going’. Adding a ‘concentrator’ as Paul calls it takes more material and moves the fire too far away from the heat of the pyrolysis bed leading to unwanted flame-outs from time to time. A major issue with all pyrolysing TLUD’s. It is simply not necessary. Just keep the fire near the fuel. This also provides additional vertical space for the flame to finish burning before getting to a cold pot surface.

Finally, here is a photo of a Vesto cutaway showing the inside parts in their correct positons.

The primary air controller is the ring with holes in it. When the handle is moved to the side the holes are closed.

Open Space is a concept to give freedom to the people. Within minimum given place, people would have access to Fire to cook (good stove), have access to food, water for drinking, source for light (apart from stove, some light from solar powered lamps), place for communication and networking with others and a place for reading books, news papers, etc. These type of "Open Spaces" would be kept in public places, especially for the poor people to access all the above facilities..

Open Space was designed by Dr. N. Sai Bhaskar Reddy..being facilitated under the theme "Be-Cause".. for the urban poor people...
http://e-openspace.blogspot.in/

File attachments: 

Pages

Subscribe to Improved Biomass Cooking Stoves RSS